summaryrefslogtreecommitdiff
path: root/source3/modules/vfs_posixacl.c
blob: 50487ff4dedcdb17346e2343886a165d47e28ddd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
/*
   Unix SMB/Netbios implementation.
   VFS module to get and set posix acls
   Copyright (C) Volker Lendecke 2006

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "system/filesys.h"
#include "smbd/smbd.h"
#include "modules/vfs_posixacl.h"

/* prototypes for static functions first - for clarity */

static bool smb_ace_to_internal(acl_entry_t posix_ace,
				struct smb_acl_entry *ace);
static struct smb_acl_t *smb_acl_to_internal(acl_t acl);
static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm);
static acl_t smb_acl_to_posix(const struct smb_acl_t *acl);


/* public functions - the api */

SMB_ACL_T posixacl_sys_acl_get_file(vfs_handle_struct *handle,
				    const char *path_p,
				    SMB_ACL_TYPE_T type)
{
	struct smb_acl_t *result;
	acl_type_t acl_type;
	acl_t acl;

	switch(type) {
	case SMB_ACL_TYPE_ACCESS:
		acl_type = ACL_TYPE_ACCESS;
		break;
	case SMB_ACL_TYPE_DEFAULT:
		acl_type = ACL_TYPE_DEFAULT;
		break;
	default:
		errno = EINVAL;
		return NULL;
	}

	acl = acl_get_file(path_p, acl_type);

	if (acl == NULL) {
		return NULL;
	}

	result = smb_acl_to_internal(acl);
	acl_free(acl);
	return result;
}

SMB_ACL_T posixacl_sys_acl_get_fd(vfs_handle_struct *handle,
				  files_struct *fsp)
{
	struct smb_acl_t *result;
	acl_t acl = acl_get_fd(fsp->fh->fd);

	if (acl == NULL) {
		return NULL;
	}

	result = smb_acl_to_internal(acl);
	acl_free(acl);
	return result;
}

int posixacl_sys_acl_set_file(vfs_handle_struct *handle,
			      const char *name,
			      SMB_ACL_TYPE_T type,
			      SMB_ACL_T theacl)
{
	int res;
	acl_type_t acl_type;
	acl_t acl;

	DEBUG(10, ("Calling acl_set_file: %s, %d\n", name, type));

	switch(type) {
	case SMB_ACL_TYPE_ACCESS:
		acl_type = ACL_TYPE_ACCESS;
		break;
	case SMB_ACL_TYPE_DEFAULT:
		acl_type = ACL_TYPE_DEFAULT;
		break;
	default:
		errno = EINVAL;
		return -1;
	}

	if ((acl = smb_acl_to_posix(theacl)) == NULL) {
		return -1;
	}
	res = acl_set_file(name, acl_type, acl);
	if (res != 0) {
		DEBUG(10, ("acl_set_file failed: %s\n", strerror(errno)));
	}
	acl_free(acl);
	return res;
}

int posixacl_sys_acl_set_fd(vfs_handle_struct *handle,
			    files_struct *fsp,
			    SMB_ACL_T theacl)
{
	int res;
	acl_t acl = smb_acl_to_posix(theacl);
	if (acl == NULL) {
		return -1;
	}
	res =  acl_set_fd(fsp->fh->fd, acl);
	acl_free(acl);
	return res;
}

int posixacl_sys_acl_delete_def_file(vfs_handle_struct *handle,
				     const char *path)
{
	return acl_delete_def_file(path);
}


/* private functions */

static bool smb_ace_to_internal(acl_entry_t posix_ace,
				struct smb_acl_entry *ace)
{
	acl_tag_t tag;
	acl_permset_t permset;

	if (acl_get_tag_type(posix_ace, &tag) != 0) {
		DEBUG(0, ("smb_acl_get_tag_type failed\n"));
		return False;
	}

	switch(tag) {
	case ACL_USER:
		ace->a_type = SMB_ACL_USER;
		break;
	case ACL_USER_OBJ:
		ace->a_type = SMB_ACL_USER_OBJ;
		break;
	case ACL_GROUP:
		ace->a_type = SMB_ACL_GROUP;
		break;
	case ACL_GROUP_OBJ:
		ace->a_type = SMB_ACL_GROUP_OBJ;
		break;
	case ACL_OTHER:
		ace->a_type = SMB_ACL_OTHER;
		break;
	case ACL_MASK:
		ace->a_type = SMB_ACL_MASK;
		break;
	default:
		DEBUG(0, ("unknown tag type %d\n", (unsigned int)tag));
		return False;
	}
	switch(ace->a_type) {
	case SMB_ACL_USER: {
		uid_t *puid = (uid_t *)acl_get_qualifier(posix_ace);
		if (puid == NULL) {
			DEBUG(0, ("smb_acl_get_qualifier failed\n"));
			return False;
		}
		ace->info.user.uid = *puid;
		acl_free(puid);
		break;
	}
		
	case SMB_ACL_GROUP: {
		gid_t *pgid = (uid_t *)acl_get_qualifier(posix_ace);
		if (pgid == NULL) {
			DEBUG(0, ("smb_acl_get_qualifier failed\n"));
			return False;
		}
		ace->info.group.gid = *pgid;
		acl_free(pgid);
		break;
	}
	default:
		break;
	}
	if (acl_get_permset(posix_ace, &permset) != 0) {
		DEBUG(0, ("smb_acl_get_mode failed\n"));
		return False;
	}
	ace->a_perm = 0;
#ifdef HAVE_ACL_GET_PERM_NP
	ace->a_perm |= (acl_get_perm_np(permset, ACL_READ) ? SMB_ACL_READ : 0);
	ace->a_perm |= (acl_get_perm_np(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0);
	ace->a_perm |= (acl_get_perm_np(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0);
#else
	ace->a_perm |= (acl_get_perm(permset, ACL_READ) ? SMB_ACL_READ : 0);
	ace->a_perm |= (acl_get_perm(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0);
	ace->a_perm |= (acl_get_perm(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0);
#endif
	return True;
}

static struct smb_acl_t *smb_acl_to_internal(acl_t acl)
{
	struct smb_acl_t *result = sys_acl_init();
	int entry_id = ACL_FIRST_ENTRY;
	acl_entry_t e;
	if (result == NULL) {
		return NULL;
	}
	while (acl_get_entry(acl, entry_id, &e) == 1) {

		entry_id = ACL_NEXT_ENTRY;

		result->acl = talloc_realloc(result, result->acl, 
					     struct smb_acl_entry, result->count+1);
		if (result->acl == NULL) {
			TALLOC_FREE(result);
			DEBUG(0, ("talloc_realloc failed\n"));
			errno = ENOMEM;
			return NULL;
		}

		if (!smb_ace_to_internal(e, &result->acl[result->count])) {
			TALLOC_FREE(result);
			return NULL;
		}

		result->count += 1;
	}
	return result;
}

static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm)
{
        int ret;
        acl_permset_t permset;

	if ((ret = acl_get_permset(entry, &permset)) != 0) {
		return ret;
	}
        if ((ret = acl_clear_perms(permset)) != 0) {
                return ret;
	}
        if ((perm & SMB_ACL_READ) &&
	    ((ret = acl_add_perm(permset, ACL_READ)) != 0)) {
		return ret;
	}
        if ((perm & SMB_ACL_WRITE) &&
	    ((ret = acl_add_perm(permset, ACL_WRITE)) != 0)) {
		return ret;
	}
        if ((perm & SMB_ACL_EXECUTE) &&
	    ((ret = acl_add_perm(permset, ACL_EXECUTE)) != 0)) {
		return ret;
	}
        return acl_set_permset(entry, permset);
}

static acl_t smb_acl_to_posix(const struct smb_acl_t *acl)
{
	acl_t result;
	int i;

	result = acl_init(acl->count);
	if (result == NULL) {
		DEBUG(10, ("acl_init failed\n"));
		return NULL;
	}

	for (i=0; i<acl->count; i++) {
		const struct smb_acl_entry *entry = &acl->acl[i];
		acl_entry_t e;
		acl_tag_t tag;

		if (acl_create_entry(&result, &e) != 0) {
			DEBUG(1, ("acl_create_entry failed: %s\n",
				  strerror(errno)));
			goto fail;
		}

		switch (entry->a_type) {
		case SMB_ACL_USER:
			tag = ACL_USER;
			break;
		case SMB_ACL_USER_OBJ:
			tag = ACL_USER_OBJ;
			break;
		case SMB_ACL_GROUP:
			tag = ACL_GROUP;
			break;
		case SMB_ACL_GROUP_OBJ:
			tag = ACL_GROUP_OBJ;
			break;
		case SMB_ACL_OTHER:
			tag = ACL_OTHER;
			break;
		case SMB_ACL_MASK:
			tag = ACL_MASK;
			break;
		default:
			DEBUG(1, ("Unknown tag value %d\n", entry->a_type));
			goto fail;
		}

		if (acl_set_tag_type(e, tag) != 0) {
			DEBUG(10, ("acl_set_tag_type(%d) failed: %s\n",
				   tag, strerror(errno)));
			goto fail;
		}

		switch (entry->a_type) {
		case SMB_ACL_USER:
			if (acl_set_qualifier(e, &entry->info.user.uid) != 0) {
				DEBUG(1, ("acl_set_qualifiier failed: %s\n",
					  strerror(errno)));
				goto fail;
			}
			break;
		case SMB_ACL_GROUP:
			if (acl_set_qualifier(e, &entry->info.group.gid) != 0) {
				DEBUG(1, ("acl_set_qualifiier failed: %s\n",
					  strerror(errno)));
				goto fail;
			}
			break;
		default: 	/* Shut up, compiler! :-) */
			break;
		}

		if (smb_acl_set_mode(e, entry->a_perm) != 0) {
			goto fail;
		}
	}

	if (acl_valid(result) != 0) {
		char *acl_string = sys_acl_to_text(acl, NULL);
		DEBUG(0, ("smb_acl_to_posix: ACL %s is invalid for set (%s)\n",
			  acl_string, strerror(errno)));
		SAFE_FREE(acl_string);
		goto fail;
	}

	return result;

 fail:
	if (result != NULL) {
		acl_free(result);
	}
	return NULL;
}

/* VFS operations structure */

static struct vfs_fn_pointers posixacl_fns = {
	.sys_acl_get_file_fn = posixacl_sys_acl_get_file,
	.sys_acl_get_fd_fn = posixacl_sys_acl_get_fd,
	.sys_acl_set_file_fn = posixacl_sys_acl_set_file,
	.sys_acl_set_fd_fn = posixacl_sys_acl_set_fd,
	.sys_acl_delete_def_file_fn = posixacl_sys_acl_delete_def_file,
};

NTSTATUS vfs_posixacl_init(void);
NTSTATUS vfs_posixacl_init(void)
{
	return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "posixacl",
				&posixacl_fns);
}